diff --git a/docs/public/api-reference/fabro-api.yaml b/docs/public/api-reference/fabro-api.yaml
index 5c294ed86..aa5938af4 100644
--- a/docs/public/api-reference/fabro-api.yaml
+++ b/docs/public/api-reference/fabro-api.yaml
@@ -1181,7 +1181,8 @@ paths:
         Failures return the standard error body. The intent lane responds
         `404` (`workflow_version_not_found`, `environment_not_found`), `422`
         (`run_intent_invalid`, `target_invalid`,
-        `target_environment_unsupported`, `workflow_version_unusable`,
+        `target_environment_unsupported`,
+        `pull_request_environment_unsupported`, `workflow_version_unusable`,
         `run_compile_invalid`), `503` (`integration_unavailable`), or `500`
         (`workflow_version_store_error`, `credential_store_error`,
         `variable_store_error`, `run_persistence_failed`).
diff --git a/docs/public/execution/run-configuration.mdx b/docs/public/execution/run-configuration.mdx
index 7db919dba..699c3b3c4 100644
--- a/docs/public/execution/run-configuration.mdx
+++ b/docs/public/execution/run-configuration.mdx
@@ -555,7 +555,7 @@ The `sandbox` transport runs the MCP server inside the workflow's sandbox. This
 
 ### `[run.pull_request]`
 
-Automatically open a GitHub pull request when the workflow run completes successfully. Requires a [GitHub App](/integrations/github) to be configured.
+Automatically open a GitHub pull request when the workflow run completes successfully. Requires a [GitHub App](/integrations/github) to be configured and a clone-based Docker or Daytona environment; run creation rejects `enabled = true` on a Local environment.
 
 ```toml title="run.toml"
 [run.pull_request]
diff --git a/lib/apps/fabro-cli/tests/it/cmd/create.rs b/lib/apps/fabro-cli/tests/it/cmd/create.rs
index 655ed1570..d8125f278 100644
--- a/lib/apps/fabro-cli/tests/it/cmd/create.rs
+++ b/lib/apps/fabro-cli/tests/it/cmd/create.rs
@@ -1560,7 +1560,7 @@ draft = false
     let workflow_owned = context
         .create_cmd()
         .current_dir(project.path())
-        .args(["--environment", "local", workflow.to_str().unwrap()])
+        .args(["--environment", "default", workflow.to_str().unwrap()])
         .assert()
         .success();
     let workflow_owned_id = created_run_id(workflow_owned.get_output());
diff --git a/lib/apps/fabro-server/src/run_intent.rs b/lib/apps/fabro-server/src/run_intent.rs
index 489306828..68aa7c7a8 100644
--- a/lib/apps/fabro-server/src/run_intent.rs
+++ b/lib/apps/fabro-server/src/run_intent.rs
@@ -133,6 +133,10 @@ pub(crate) enum EnvironmentSelectionError {
     NotFound { id: EnvironmentId },
     #[error("{detail}")]
     TargetUnsupported { detail: &'static str },
+    #[error(
+        "automatic pull requests require a clone-based Docker or Daytona environment; disable run.pull_request.enabled for Local execution"
+    )]
+    AutomaticPullRequestUnsupported,
     #[error("{detail}")]
     ProviderDisabled {
         provider: SandboxProviderKind,
diff --git a/lib/apps/fabro-server/src/server/handler/runs.rs b/lib/apps/fabro-server/src/server/handler/runs.rs
index 236e0ec63..2c9076e89 100644
--- a/lib/apps/fabro-server/src/server/handler/runs.rs
+++ b/lib/apps/fabro-server/src/server/handler/runs.rs
@@ -1041,6 +1041,11 @@ fn run_intent_admission_error(error: RunIntentAdmissionError) -> Response {
                 error.to_string(),
                 "target_environment_unsupported",
             ),
+            EnvironmentSelectionError::AutomaticPullRequestUnsupported => intent_error(
+                StatusCode::UNPROCESSABLE_ENTITY,
+                error.to_string(),
+                "pull_request_environment_unsupported",
+            ),
             EnvironmentSelectionError::ProviderDisabled { .. }
             | EnvironmentSelectionError::MissingCredential { .. } => intent_error(
                 StatusCode::SERVICE_UNAVAILABLE,
@@ -1118,6 +1123,11 @@ async fn validate_intent_environment(
     if image_incompatible || target_incompatible {
         return Err(EnvironmentSelectionError::TargetUnsupported { detail });
     }
+    // Settings resolution drops `run.pull_request` unless it is enabled, so
+    // `Some` means automatic pull requests were requested.
+    if !configured_provider.is_clone_based() && settings.run.pull_request.is_some() {
+        return Err(EnvironmentSelectionError::AutomaticPullRequestUnsupported);
+    }
     if let Some(detail) =
         run_manifest::sandbox_provider_policy_error(&state.server_settings(), effective_provider)
     {
diff --git a/lib/apps/fabro-server/src/server/tests.rs b/lib/apps/fabro-server/src/server/tests.rs
index 7f23d1989..c70c92486 100644
--- a/lib/apps/fabro-server/src/server/tests.rs
+++ b/lib/apps/fabro-server/src/server/tests.rs
@@ -4251,6 +4251,101 @@ async fn post_runs_run_intent_canonicalizes_and_persists_a_local_folder_target()
     assert!(projection.spec.definition_blob.is_some());
 }
 
+#[tokio::test]
+async fn post_runs_run_intent_rejects_automatic_pull_requests_for_local_environment() {
+    let target = tempfile::tempdir().unwrap();
+    let state = local_test_app_state();
+    let app = crate::test_support::build_test_router(Arc::clone(&state));
+    let workflow_version_id = store_workflow_version(
+        &state,
+        MINIMAL_DOT,
+        Some("_version = 1\n[run.pull_request]\nenabled = true\n"),
+    )
+    .await;
+
+    let response =
+        post_run_intent_response(&app, folder_intent(workflow_version_id, target.path())).await;
+    let body = response_json!(response, StatusCode::UNPROCESSABLE_ENTITY).await;
+
+    assert_eq!(
+        body["errors"][0]["code"],
+        "pull_request_environment_unsupported"
+    );
+    assert_eq!(
+        body["errors"][0]["detail"],
+        "automatic pull requests require a clone-based Docker or Daytona environment; disable run.pull_request.enabled for Local execution"
+    );
+    assert!(state.runs.lock().expect("runs lock poisoned").is_empty());
+    assert!(
+        state
+            .stores
+            .run_summaries
+            .list_identities()
+            .await
+            .unwrap()
+            .is_empty()
+    );
+}
+
+#[tokio::test]
+async fn post_runs_run_intent_accepts_disabled_pull_requests_for_local_environment() {
+    let target = tempfile::tempdir().unwrap();
+    let state = local_test_app_state();
+    let app = crate::test_support::build_test_router(Arc::clone(&state));
+    let workflow_version_id = store_workflow_version(
+        &state,
+        MINIMAL_DOT,
+        Some("_version = 1\n[run.pull_request]\nenabled = false\n"),
+    )
+    .await;
+
+    // `post_run_manifest` asserts the `201 Created` admission outcome.
+    post_run_manifest(&app, folder_intent(workflow_version_id, target.path())).await;
+}
+
+#[tokio::test]
+async fn post_runs_run_intent_accepts_automatic_pull_requests_for_configured_docker_dry_run() {
+    let state = test_app_state();
+    let app = crate::test_support::build_test_router(Arc::clone(&state));
+    let workflow_version_id = store_workflow_version(
+        &state,
+        MINIMAL_DOT,
+        Some("_version = 1\n[run.pull_request]\nenabled = true\n"),
+    )
+    .await;
+
+    let body = post_run_manifest(
+        &app,
+        json!({
+            "workflow_version_id": workflow_version_id,
+            "target": {
+                "kind": "git",
+                "repo": "fabro-sh/fabro",
+                "branch": "main"
+            },
+            "args": { "dry_run": true }
+        }),
+    )
+    .await;
+    let run_id = body["id"].as_str().unwrap().parse::<RunId>().unwrap();
+    let projection = state
+        .stores
+        .runs
+        .open_run_reader(&run_id)
+        .await
+        .unwrap()
+        .state()
+        .await
+        .unwrap();
+
+    assert_eq!(
+        projection.spec.settings.run.environment.provider,
+        EnvironmentProvider::Docker
+    );
+    assert_eq!(projection.spec.settings.run.execution.mode, RunMode::DryRun);
+    assert!(projection.spec.settings.run.pull_request.is_some());
+}
+
 #[tokio::test]
 async fn post_runs_run_intent_observes_folder_git_metadata_without_a_remote_call() {
     let dir = tempfile::tempdir().unwrap();